28/09/2012 08:15:47.708 SuperCard 4.7[389]: The function `CGSFlushWindow' is obsolete and will be removed in an upcoming update. Unfortunately, this application, or a library it uses, is using this obsolete function, and is thereby contributing to an overall degradation of system performance. Please use `CGSFlushWindowContentRegion' instead.

Set a breakpoint on CGSFlushWindow. If you do, you'll likely find it's being triggered by QDFlushPortBuffer, a Carbon Toolbox call. The warning is harmless, there's no workaround, and Apple is aware of the problem.